Grate bar



T. A. JESSEN Sept. 8, 1931.

GRATE BAR Filed Aug. 17, 1929 Fig. 2

Fig 3 [area/or rfieodo/vldolpb Jess en Patented Sept. 8, 1931 THEODORADOLlPI-I JESSEN, OF HUSUM, GERMANY GRATE BAR Application filed August17, 1929, Serial No. 386,703, and in Austria October 27, 1928.

My invention relates to grate bars and it is an object of my inventionto so design a grate bar that the circulation of the air through thefuel bee is improved.

To this end I provide on tne gra'e plurality of vanes which are directedag the draught, and make the first rib rhoi than the other ribs.

In the drawings afiixed to this spociiisa tion and ferming part thereof,graie cinbodying my invention is illustrated diagrammatically by way ofexample.

In the drawings Fig. l is a cross section of two grate bars,

Fig. 2 is an elevation of one of the bars, and

Fig. 3 is a plan View of the two Referring now to the drawings, the bar(Z is provided with a tapered downwarc ly extending rib a which isequipped with lateral vanes Z) extending from the upper and widest partof the bar to the lower e-Ige of the rib a. As will appear i'rom 2, Ihevanes b are so arranged that their lower ends are leading in thedirection. of the draught which is supposed to come from the right inJig. 2. They are preferably curved and reduced or pointed at their lower0 ends. 0 is the first rib which is shorter than the other ribs, and itwill be understood that by thus reducing the length of the first rib thedraught is divided and deflected towards the front as well as the rearportion of the bar, and distributed uniformly throughout the length ofthe fuel bed.

As the ribs are reduced in thickness toward their lower ends the widthof the passages between the ribs is conversely reducer toward theirupper ends so that the velocity of the flow increases toward the upperends of the air passages, and the upper parts of the grate bars will becooled most intensely.

As the air is admitted to the fuel bed not in a Vertical but in aninclined direction, it is distributed uniformly and supplies anincreased quantity of oxygen to the fuel bed without interfering withthe space required for the movement of grate hooks or other implement.

fl au acen I wish it to be understood that I do not desire to be limitedto the exact details of construction shown and described for obviousmodifications will occur to a person skilled in the art.

In the claim affixed to this specification no selection of anyparticular modification of the invention is intended to the exclusion ofother modifications thereof and the right to subsequently make claim toany modiiio0 cation not covered by the claim is expressly reserved.

I claim A grate bar having a body at its upper cud which constitutes abearin surface and G5 is of uniform section throughout its effectivelength a tapered rib projecting downwardly from said body, and inclinedvanes on said rib, one end vane being shorter than the others and theouter edges of said vanes being within the projected horizontal area ofsaid body.

In testimony whereof I afiix my signature.

THEODOR ADOLPH J ESSEN.

